Mole Fraction
- The mole fraction is a unit of concentration, defined to be equal to the number of moles of a component divided by the total number of moles of a solution
- The mole fraction is determined for all reactants in a mixture of gases
- g. to find the mole fraction of A (Xa):
Partial pressure
- Partial pressure it the pressure exerted by the single gas if it were isolated
- The total pressure is the combined total of all the partial pressures
- To determine the partial pressure for one gas, multiply the mole fraction by the total pressure
- g. to find the partial pressure of A (PA):
- Units for partial pressure Pascals or atmospheres
PA = Mole Fraction of A x Total Pressure
PA = Xa x P
Kp in homogeneous gaseous equilibria
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- Homogeneous Equilibria refers to all involved reactants are in the same phase
- For Kp to function, everything must be a gas
- Kp will always be a constant except for a change in temperature
Kp in heterogeneous equilibria
- Heterogeneous equilibrium will involve gases in contact with solids
- As Kp functions only with a gas, the solid is not included